It’s a charming act, which makes the tea-party movement seem no more unnerving than the people who spend their weekends reenacting the Civil War. But the 18th-century getups mask something disturbing. After I spent the weekend at the Tea Party National Convention in Nashville, Tenn., it has become clear to me that the movement is dominated by people whose vision of the government is conspiratorial and dangerously detached from reality. It’s more John Birch than John Adams.

Like all populists, tea partiers are suspicious of power and influence, and anyone who wields them. Their villain list includes the big banks; bailed-out corporations; James Cameron, whose Avatar is seen as a veiled denunciation of the U.S. military; Republican Party institutional figures they feel ignored by, such as chairman Michael Steele; colleges and universities (the more prestigious, the more evil); TheWashington Post; Anderson Cooper; and even FOX News pundits, such as Bill O’Reilly, who have heaped scorn on the tea-party movement’s more militant oddballs. […]

I consider myself a conservative and arrived at this conference as a paid-up, rank-and-file attendee, not one of the bemused New York Times types with a media pass. But I also happen to be writing a book for HarperCollins that focuses on 9/11 conspiracy theories, so I have a pretty good idea where the various screws and nuts can be found in the great toolbox of American political life.

Within a few hours in Nashville, I could tell that what I was hearing wasn’t just random rhetorical mortar fire being launched at Obama and his political allies: the salvos followed the established script of New World Order conspiracy theories, which have suffused the dubious right-wing fringes of American politics since the days of the John Birch Society. […]

Perhaps the most distressing part of all is that few media observers bothered to catalog these bizarre, conspiracist outbursts, and instead fixated on Sarah Palin’s Saturday night keynote address. It is as if, in the current overheated political atmosphere, we all simply have come to expect that radicalized conservatives will behave like unhinged paranoiacs when they collect in the same room. [Um, Hello!?]

That doesn’t say much for the state of the right in America. The tea partiers’ tricornered hat is supposed to be a symbol of patriotism and constitutional first principles. But when you take a closer look, all you find is a helmet made of tin foil.

At any rate, the fact that the Tea Parties have gotten this far with their incoherent and often times hypocritical message (to say nothing of the lunatics and racists and militia types) is a sign to me there is no amount of bullshit our media won’t swallow. The fact that it is allegedly a “populist” movement that was inspired by a tantrum from millionaire tv financial personality and a Brooks Brothers mafia on the Chicago trading floor, upset over meager plans to help troubled mortgage holders in the wake of a near trillion dollar bailout of the the wealthy elite who pay Rick Santelli’s salary, just ups the humor value in this theatre of the absurd. Nothing cracks me up like an angry peasant mob screaming for the repeal of the estate tax and ending the capital gains tax.